/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

#ifndef __DEVICEACCESS_NIO_H
#define __DEVICEACCESS_NIO_H

#include <jni.h>

/* Gets various information about a NIO byte buffer:
 *
 * directArray - direct buffer address     (set to null, if the given buffer is not a direct buffer)
 * heapArray   - heap byte array reference (set to null, if the given buffer is a direct buffer)
 * offset      - offset for the heap array (set to 0, if the given buffer is a direct buffer)
 * position    - byte buffer position
 * capacity    - byte buffer capacity
 * limit       - byte buffer limit
 * readonly    - byte array readonly flag  (set to false, if the given buffer is a direct buffer)
 *
 * Returns false, if the used knowledge about the ByteBuffer class internals cannot
 * be applied, i.e. class member names do not match or such like.
 */

bool getByteBufferInformation(JNIEnv* env, jobject buffer,
  /*OUT*/ jbyte** directArray, /*OUT*/ jbyteArray* heapArray,
  /*OUT*/ jint* offset, /*OUT*/ jint* position, /*OUT*/ jint* capacity,
  /*OUT*/ jint* limit, /*OUT*/ jboolean* readonly);

/* Sets position of a NIO byte buffer.
 *
 * Returns false, if the used knowledge about the ByteBuffer class internals cannot
 * be applied, i.e. class member names do not match or such like.
 */
bool setByteBufferPosition(JNIEnv* env, jobject buffer, jint position);

#endif /* __DEVICEACCESS_NIO_H */
